Blowing- and filling thorn

ABSTRACT

A blowing- and filling-thorn for production of hollow bodies, in particular bottles, of thermoplastic synthetic material in a blowing process and for filling this hollow body, which comprises as a blowing tube mounted axially displaceable and having at least one blowing air channel. A filling tube is coaxially slidably mounted in the blowing tube, and has a filling valve in front of the mouth of its filling channel. At least one airing channel, is provided and the mouth of the blowing air channel and of the airing channel, in case the filling tube is moved into the blowing tube, is disposed diametrically opposite each other on a circular line comparatively narrowly surrounding a plate of a filling valve. The blowing tube is equipped with an annular deflection edge, overreaching the mouth of the blow air- and airing-channels on the outside, and is bent at a distance thereto inwardly in the direction toward the filling tube up to its outer circular line, and has air passage openings.

, nite Naumann Aug. 6. 1974 BLOWING- AND FILLING THORN [75] Inventor:Wilhelm Naumann, Baden, P r 1mm) Exammer*TravlS MCGehee German y 57ABSTRACT [73] Asslgnee: ill-ma w g sg A blowingand filling-thorn forproduction of hollow g' asc Ag s bodies, in particular bottles, ofthermoplastic synthetic tt mgen a ermany material in a blowing processand for filling this hol- [22] Filed: Feb. 26, 1973 low body, whichcomprises as a blowing tube mounted axially displaceable and having atleast one blowing air [2H Appl 1 channel. A filling tube is coaxiallyslidably mounted in the blowing tube, and has a filling valve in frontof the [30] Foreign Application Priority Data mouth of its fillingchannel. At least one airing chan- Feb. 25, 1972 Germany 2208909 He]! isProvided and the mouth of the blowing channel and of the airing channel,in case the filling 52 us. 01 53/191, 53/140 425/387 tube is moved intothe blowing tube is disposed 51 1111. C1 1365a 47/08 metrically Oppositeeach other on a circular line [58] Field 01 Search ..53/191 140-Paratively narrowly Surrounding a Plate of a filling 425/387 DIQ 204 dvalve. The blowing tube is equipped with an annular deflection edge,overreaching the mouth of the blow [56] References Cited airandairing-channels on the outside, and is bent at a distance theretoinwardly in the direction toward the 3 311 949 EA PATENTS 53/19 fillingtube up to its outer circular line, and has air oran 3.328.837 7/1967Moran 53/140 x passage Openmgs' 3.523.330 8/1970 Gallay 53/140 X 4Claims, 5 Drawing Figures PATENTEDAUG slam SHEET 1 BF 3 i BLOWING- ANDFILLING THORN The present invention relates to a blowingandfilling-thorn for an apparatus for production of hollow bodies, inparticular bottles of thermoplastic synthetic material in a blowingprocess, and for filling these hollow bodies, with a blow tube axiallydisplaceably mounted, and having at least one blow-air-channel and afilling tube coaxially displaceably mounted in the blow tube, and havinga filling tube including a filling valve in front of the mouth of itsfilling channel, as well as at least one airing channel.

During blowing and filling of hollow bodies of synthetic material theblowingand filling-thorn performs a plurality of functions, as blowing,filling, airing and suction of foam, for which purpose it has aplurality of channels with valves to be opened and closed at differ--ent time intervals. By this arrangement in particular the thorn for theproduction of narrow-necked bottles becomes complicated and expensive.Particularly, if the thorn is used for filling of fat-containing foodsor liquids, respectively, as by example milk in bottles ofpolyvinylchloride, additional measures must be taken againstafter-dripping of the filling liquid, as well as for a thorough rinsingof the hollow bodies prior to filling.

It is one object of the present invention, to provide a blowingandfilling-thorn simple in its structure which thorn fulfills all requiredfunctions without objection, even by use of polyvinylchloride ascontainer material.

It is another object of the present invention, to provide a blowingandfilling thorn, wherein the terminals of the blow air channel and of theairing channel are diametrically disposed relative to each other withthe filling tube inserted into the blowing tube about on a circular linecomparatively narrowly surrounding the plate of the filling valve. Theblowing tube is equipped with an annular deflection edge, overreachingthe mouth of the blow air-and airing-channels on the outside, and isbent at a distance thereto inwardly in the direction toward the fillingtube up to its outer circular line, and has air passage openings.

By this arrangement it is brought about, that all required functions areperformed with three channel systems only. Furthermore a favorablearrangement of these three channels in the thorn in narrowest space hasbeen found, with which during the blowand filling procedures a reverserinsing in the space of the hollow body is made passible and with whicha drop disposed on the lower thorn can be blown off without an expensivesuction device controlled by valves directly after the filling process.The blow air is directed in advantageous manner after the fillingprocess so tight below the filling valve, that the collecting liquiddropsare blown off and do not influence during the following blowprocess the container material.

With these and other objects in view which will be come apparent in thefollowing detailed description, the present invention, which is shown byexample only,

will be clearly understood in connection with the ac companyingdrawings, in which:

FIG. 1 is an axial section of the lower broken up end of a 'blowingandfilling-thorn, in accordance with a first embodiment shown by example ina closed blow form, with a partly moved-out filling tube;

2 FIG. 2 is a section similar to thatof FIG. 4 with a moved-in fillingtube after the filling process;

FIG. 3 is a section along the lines A-B of FIG. 1; FIG. 4 is a sectionalong the lines C-D of FIG. 1; and

FIG. 5 is a cross section of FIG. 2 of a blowingand filling-thorn inaccordance with a second embodiment.

Referring now to the drawings and in particular to FIG. 1, a dividedblow form 10 for a blowand fillingmachine is shown in closed position.On its wall surrounding the upper opening, sits a blowand fillingthorn11, shown fragmentary with an adjoint conical piece, which clampstightly the end section of a hoselike extruded form blown up to a hollowbody 12 and still being in its plasticizing heat. The blowand .fillthornis in known manner mounted axially displaceable in the vertical centerplane of the blow-head of the blowand filling-machine.

In the first embodiment in accordance with FIGS. 1-4, the blowandfilling-thorn contains a relatively thick walled, blow tube 13 with itsalready mentioned conical adjoint piece annularly surrounding within therange of the mouth on the outside for mounting the thorn to an adjustedface of the blow form-opening. Along through the blow-tube six channels15 and 16 extend through their wall, which are disposed, as shown by thecross-section in FIG. 3, adjacent each other on a circular line indiametrically arranged groups of three channels each. On the mouth sidethe channels terminate open, while they are connected on the oppositeside in the blow-head in groups with feeding and removing systems forthe blow-air and for the airing (not shown) and valve-controlled. As itis indicated in FIGS. 1 and 2 by arrows, the channels 15 of one groupare connected with the feed line for the blow-air and the channels 16 ofthe second group disposed diametrically to the first group are connectedto the feed off portion for airing of the hollow body.

Below the conical connection 14, the blow-tube is equipped with adeflection edge 17 which is annular shown in FIG. 4 in cross-section,overreaching the mouth of the blow-air and airing-channels on theoutside and bent over inwardly to the channel mouth at a distance tothis channel mouth. The annular gap formed between the mouth edge andthe deflection edge is made by two separation stays 18 disposeddiametrically to each other to two annular gap-halves l9 and 20. The oneannular gap-half 19 is disposed below the first group of the channels 15and the second annular gap-half 20 is arranged below the second group ofthe channels 16. In the side wall of the deflection edge 17 are provideda plurality of air passage openings 21 disposed on a circular line.Theinner diameter of the bent over edge part corresponds to the innerdiameter of guide and bearing sections 22, which are arranged in theblow-tube on the inside within the range of the mouth and of theblow-head (not shown) for mounting and guiding of a filling tube 23.

The filling'tube 23 is mounted coaxially and displaceably in thelongitudinal direction. It is capable of travel ling out up to thebottom of the blow form 10 out of the blow. tube and has in front ofthis side of the mouth opening a plate 24 of a filling valve, the shaft25 of which extends within the filling tube up to a control device (notshown) in the blow head. 4

The operation of the blowand filling-them is as follows.

After insertion of a hose-like form or briquet into the blow form andits closing, the blowand filling-thorn sits with its conical adjointpiece 14 on the opening edge of the form. Thereafter the form with itslower edge section between the bottom closing edges of the blow form andwith its upper edge section between the head-sided opening edge of theblow formand the blow-tube extension is set. The filling tube 23 isthereby in the position travelled into the blow-tube 13, as it is shownin FIG. 2. The blow-air required for the blowing up of the form throughthe first group of the channels 15 and the completely opened deflectionedge 17 by means of airing channels 16 closed by valves (not shown) intothe hollow space of the form and forms the latter with sufficientpressure, build-up to a hollow body.

Thereafter the fill-tube 23 moves out of the blowtube, whereby the largeopening, disposed in the inner circle of the annular deflection edge 17is closed by the filling-thorn. During this procedure takes place athorough rinsing of the hollow body, since further blow-air is pressedfrom the channels 15 through air passage openings 21 on this side of thedeflection edge 17 into the hollow body and is fed off jointly with gasremainders from the heated material of the hollow body through theoppositely disposed air passage openings of the deflection edge and thenow completely opened airing channels 16. Simultaneously the wall of thehollow body cools up sufficiently so that any further gas development isavoided. If necessary, the described reverse rinsing can be continuedduring the following filling process.

After the filling process, in which the filling tube 23 closely belowthe liquid level is moved upwardly with the latter and is movedcompletely again into the blowtube, as shown in FIG. 2, the plate 24 ofthe filling valve, which is closed again, renders free the spacedisposed within the deflection edge 17 between the mouth of thediametrically disposed blow-air channels 15 and airing channels 16 for adirect air passage. The blow-air guidedby means of the deflection edge17 below the valve plate 24 blows off liquid drops collecting at theform end.

For the filling of strongly foaming liquids a hose 26 of a suctiondevice (not shown) and provided in the blow head is connected with theairing channels 16, which suction device sucks up by means of one ormore of the channels 16 the foam as well as, under circumstances, thedrops collecting at the thorn into a collecting container. For thecomplete suction of the foam the liquid level of the completely filledhollow body is arranged below the channel mouth, thus about at theheight of the thorn-lower-edge. The blowing or suction of the liquiddrops takes place directly after the lifting of the thorn from the blowform.

ln FIG. 5 the cross-section of the blowand filling thorn is shown inaccordance with the second embodiment. Thus merely the blow-tube 27distinguishes from the blow-tube 13 of the first embodiment in itsstructure. The blow-tube 27 is produced of two tubes 28 and 29 disposedconcentrically within each other. Their walls are kept spaced apart ofeach other by means of a uniform distance forming an annular gap and areconnected in two sections diametrically disposed from each other by twoseparation walls 30 disposed passing through in longitudinal direction.Thereby an annular gap formed between the tubes is divided into twochannels 31 and 32 disposed diametrically opposite each other, whichcorresponds with the channel-groups l5 and 16 of the first embodiment.With the exception of this simplified structure of the blow-tube, thethorn is identical with that of the first embodiment and is furthersubstantially equal in its operation.

In both embodiments the blow-tube 13 or 27, respectively, has within therange of the mouth sitting on the blow-thorn 10 the already mentionedconical adjoint piece 14 extending annularly on the outside, with whichadjoint piece 14 the blow-tube comes into rigid contact with the hotform and thereby is exposed to a strong heating. The cooling of theblow-tube takes place at least partly by the air streaming in itschannels 15 and 16 or 31 and 32, respectively. Beyond that, within therange of the conical adjoint piece 14 on the inner side of theblow-tube, a likewise annular guideand bearing-section 22 is arrangedfor the moving-in and moving-out filling-tube 23. The face contactcauses feeding away of the heat onto the filling-tube and the mostlycold filling liquid. By this arrangement a strong heating of theblow-tube and thereby an undesirable expansion of its mouth part isavoided, which leads to an extensive maintenance of the wall thicknessin the head of the hollow body.

While I have disclosed several embodiments of the present invention, itis to be understood that these embodiments are given by example only andnot in a limiting sense.

I claim:

1. A blowingand filling-thorn for production of hollow bodies, inparticular bottles, of thermoplastic synthetic material in a blowingprocess and for filling this hollow body, comprising a blowing tubemounted axially displaceable and having at least one blowing airchannel,

a filling tube coaxially slidably mounted in said blowing tube, andhaving a filling valve in front of the mouth of its filling channel,

at least one airing channel,

the mouth of said blowing air channel and of said airing channel, incase said filling tube is moved into said blowing tube, being disposeddiametrically opposite each other on a circular line comparativelynarrowly surrounding a plate of a filling valve,

said blowing tube is equipped with an annular deflection edge,overreaching the mouth of said blow airand airing-channels on theoutside, and bent at a distance thereto inwardly in the direction towardsaid filling tube up to its outer circular line, and having air passageopenings.

2. The blowingand filling thorn, as set forth in claim 1, wherein saidblowing tube comprises two tubes, disposed concentrically and with anannular gap defining channels in each other, and connected together bymeans of separation walls diametrically disposed relative to each other,and

the lower edge section of the outer of said tubes is formed to saiddeflection edge.

3. The blowingand filling-them, as set forth in claim 2, wherein saidairing channel is connected with a suction device having a suction hoseand the latter is attached to said airing channel.

, 6 4. The blowingand filling-thorn, asset forth in claim said blow tubehaving on its inner side within the whch Includes range of said adjointpiece a likewise annular ablow tube, v a conical adjoint piece extendingannularly and gu1deand bearing-section for said llling tube.

mounted on the outside of said blow tube, 5

1. A blowing- and filling-thorn for production of hollow bodies, inparticular bottles, of thermoplastic synthetic material in a blowingprocess and for filling this hollow body, comprising a blowing tubemounted axially displaceable and having at least one blowing airchannel, a filling tube coaxially slidably mounted in said blowing tube,and having a filling valve in front of the mouth of its filling channel,at least one airing channel, the mouth of said blowing air channel andof said airing channel, in case said filling tube is moved into saidblowing tube, being disposed diametrically opposite each other on acircular line comparatively narrowly surrounding a plate of a fillingvalve, said blowing tube is equipped with an annular deflection edge,overreaching the mouth of said blow air-and airing-channels on theoutside, and bent at a distance thereto inwardly in the direction towardsaid filling tube up to its outer circular line, and having air passageopenings.
 2. The blowing- and filling thorn, as set forth in claim 1,wherein said blowing tube comprises two tubes, disposed concentricallyand with an annular gap defining channels in each other, and connectedtogether by means of separation walls diametrically disposed relative toeach other, and the lower edge section of the outer of said tubes isformed to said deflection edge.
 3. The blowing- and filling-thorn, asset forth in claim 2, wherein said airing channel is connected with asuction device having a suction hose and the latter is attached to saidairing channel.
 4. The blowing- and filling-thorn, as set forth in claim3, which includes a blow tube, a conical adjoint piece extendingannularly and mounted on the outside of said blow tube, said blow tubehaving on its inner side within the range of said adjoint piece alikewise annular guide- and bearing-section for said filling tube.